Co2 refrigeration system for ice-playing surface

A CO2 refrigeration system for an ice-playing surface, comprising:

• a transfer circuit in which a transfer refrigerant circulates between a condensation heat exchanger to absorb heat, and an evaporation heat exchanger to release heat;
• a CO2 refrigerant circuit in heat-exchange relation with the condensation heat exchanger to release heat from the CO2 refrigerant, the CO2 refrigerant circuit comprising:
• a condensation reservoir accumulating a portion of the CO2 refrigerant in a liquid state;
• an evaporation stage receiving the CO2 refrigerant from the condensation reservoir to absorb heat from the ice-playing surface;
• an independent condensation circuit in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger, the independent condensation circuit comprising:
• a compression stage with at least one magnetically operated compressor to compress a secondary refrigerant;
• a condensation stage in which the secondary refrigerant releases heat;
• and
• an evaporation stage in which the secondary refrigerant is in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger to absorb heat therefrom.